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. 2022 Jun 21;84(8):76. doi: 10.1007/s11538-022-01037-z

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Fig. 10 — Illustration of the proof of Lemma 8 for the case $t (q) > t (u)$ . a When q is a tree node, the tail of the reticulation arc (p, r) is moved up. b When q is a reticulation at the top, an LCA y of u and q is a parent of q with $t (y) = t (q)$ , leading to a contradiction to the assumption $t (q) > t (u)$